https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121612

--- Comment #1 from Paul-Antoine Arras <parras at gcc dot gnu.org> ---
Actually we have:

/* { dg-require-effective-target riscv_zvfh } */

so it is check_effective_target_riscv_zvfh (without trailing _ok) that gets
called, hence the lack of runtime check.

If we replace it with:

/* { dg-require-effective-target riscv_zvfh_ok } */

then check_effective_target_riscv_zvfh_ok gets called and the runtime check
fails with:

xgcc: error: '-march=rv64gcvv_zicsr_zifencei_zaamo_zalrsc': extension 'v'
appear more than one time

This is caused by:

set gcc_march [regsub {[[:alnum:]]*} [riscv_get_arch] &v]

which unconditionally adds 'v' to march.

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